Peptide synthesis inside a cell takes place in

(a) mitochondria

(b) chromoplast

(c) ribosomes

(d) chloroplast

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Which one of the following structures between two adjacent cells is an effective transport pathway?

(a) Plasmodesmata

(b) Plastoquinones

(c) Endoplasmic rcticulum

(d) Plasmalemma

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Which one of the following has its own DNA?

(a) Mitochondria

(b) Dictyosome

(c) Lysosome

(d) Peroxisome

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The main arena of various types of activities of a cell is

(a) plasma membrane

(b) mitochondrion

(c) cytoplasm

(d) nucleus

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The plasma membrane consists mainly of

(a) phospholipids embedded in a protein bilayer

(b) proteins embedded in a phospholipid bilayer

(c) proteins embedded in a polymer of glucose molecules

(d) proteins embedded in a carbohydrate bilayer

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Stroma in the chloroplasts of higher plants contains

(a) light-independent reaction enzymes

(b) light-dependent reaction enzymes

(c) ribosomes

(d) chlorophyll

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Middle lamella is mainly composed of

(a) hemicellulose

(b) muramic acid

(c) calcium pectate

(d) phosphoglycerides

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Plasmodesmata are

(a) lignified cemented layers between cells

(b) locomotory structures

(c) membranes connecting the nucleus with plasmalemma

(d) connections between adjacent cells

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Cytoskeleton is made up of

(a) calcium carbonate granules

(b) callose deposits

(c) cellulosic microfibrils

(d) proteinaceous filaments

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Keeping in view the 'fluid mosaic model for the structure of cell membrane, which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other (described as flip-flop movement)?

(a) Both lipids and proteins can flip-flop

(b) While lipids can rarely flip-flop, proteins cannot

(c) While proteins can flip-flop, lipids cannot

(d) Neither lipids, nor proteins can flip-flop

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